Abbreviation for author’s alterations. Author’s alterations are changes made to a job after it has already been sent to a […]


The property that causes paper to absorb liquids or vapors in contact with it. In optics, the partial suppression of […]

Back Up

Printing the second side of a sheet already printed on one side.

Back-trap mottle

Non-uniform trapping of previously laid down ink film(s) onto an offset lithographic blanket mostly caused by non-uniform ink setting and/or […]


The back of a bound book connecting the two -covers; also called spine.